Question

Describe double fertilization in plants

Answer 1

In plants , two male gametes are produced by the generative cell of pollen grain ,in which one male gamete fuse with egg cell and another male gamete fuse with polar nuclei resulting in double fertilisation

Answer 2

Answer :

double fertilization

Involves the fusion of male and female gametes (syngamy) and fusion of male gamete with a secondary  nucleus (triple fusion)  After discharge from the pollen tube, one of the male gametes fuses with the egg and forms the oospore  (zygote). This is called true fertilisation (also called syngamy = amphimixis). The oospore is diploid (2n).

The second male gamete fuses with the secondary nucleus (2n) and forms a triploid (3n) nucleus, called  the endosperm mother nucleus. This is called triple fusion. Thus both the male gametes participate in  fertilisation, i.e., fertilisation takes place twice.

This is called double fertilisation. (Double fertilisation includes syngamy as well as triple fusion), zygote  produced, as a result of syngamy develops into an embryo and the triploid nucleus (Endosperm mother  nucleus), develops into the endosperm which is used for nutrition of embryo. Antipodals and synergids  degenerate after fertilisation.